Garand Thumb provides an expert-level assessment of the FN M16A4, highlighting its evolution from the M16A2 with features like a flat-top receiver and M5 RAS for optics. He critically examines the three-round burst mechanism's 'memory' flaw while appreciating the rifle's reliability, soft recoil, and the ballistic advantages of its 20-inch barrel, making it an iconic and effective combat platform.
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